6MM Ackley Improved VS 6-284

dawgmaster

dawgmaster

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Hopefully I've got this topic in the right forum??? Sorry if I don't I'm new!:confused:

I just ordered a new 700 VLS. I'll soon be ordering a 26" barrel with a 1 in 12 twist. It'll be built on a short action and we'll install a single shot follower, so bullet length won't be an issue.
The rifle will be mostly used for target shooting and coyotes with a yearly deer taken.
Therefore, I'm gonna shoot 60-70gr pills with a load worked up with 87 or 90gr pills for deer.
I understand the 6-284 is slightly faster, but with the research I've done it seems the 60-70gr pills are pretty similar velocities between the two. However, the 6-284 seems to require more powder to do so.

I'd like to hear pros and cons of both...

I'm leaning towards the 6MM AI mainly cause I think it'll have slightly less recoil.

Also can someone give some insight on the case forming with each?
 
Hi Dawgmaster, Welcome to the forum.

I shoot both the 6AI and the 6/284.
The 6mm AI will out do the 6/284 on any give day speed wise and you`ll also be able to run slightly heavier bullets.
It will also out do the 240 Weatherby as well, I know this as I also have one.
I`d go for the 6mm AI for sure.

Garnet
 
That's encouraging to hear dusty. Thanks.
It's always nice to have someone with hands on knowledge of both.
I'm glad to hear it performs with the 240 as well...my gunsmith was doubtful but I looked it up on reloadersnest and it defenitley appeared to be able to hang with the 6-284, 240, 25-06, 243AI etc

Sounds like yah got a pretty nice selection of wildcats.

I've got a 19-223 Calhoon and a 22-243 MIddlestead.

This one will be a dual purpose rifle.
 
The nice thing about both of these cartridges is, if you don't like your barrel, you won't have to put up with it for long! Both will show significant erosion by the 800 round mark. Regards, Bill.
 
280_ACKLEY said:
The 6-284 should outrun the 6mm AI all things being equal w/same pressures as it has a greater case capacty.
Click to expand...

cant be by much...as a 284 shouldn't hold much more powder than a 7x57AI..which shouldnt be too far off a 280 Rem

its pretty hard to out 243 a 243 :jerkit:
 
todbartell said:
cant be by much...as a 284 shouldn't hold much more powder than a 7x57AI..which shouldnt be too far off a 280 Rem

its pretty hard to out 243 a 243 :jerkit:
Click to expand...

~3-5 grains IIRC extra for the 6-284....not much, but certainly not giving the 6mm AI a boiler room advantage over the 240 Roy or 6-284.

They all suck..make mine a 243 AI:D
 
I have a 6-284, and a 6mm Rem, and a 6mm Rem AI and a 240 Gibbs (and a 243 and a 6x47). In terms of velocities, in my rifles, it goes (slowest to fastest); 6x47, 243, 6mm Rem, 6mm Rem AI, 6mm-284, 240 Gibbs. Case capacity is usually the deciding factor in this argument, and the 6-284 has more CC then the 6 Rem AI. But not by much. They're close enough that barrel differences could change which one is quicker easily. FWIW - dan
 
dusty61 said:
Hi Dawgmaster, Welcome to the forum.

I shoot both the 6AI and the 6/284.
The 6mm AI will out do the 6/284 on any give day speed wise and you`ll also be able to run slightly heavier bullets.
It will also out do the 240 Weatherby as well, I know this as I also have one.
I`d go for the 6mm AI for sure.

Garnet
Click to expand...

what makes the 6mmAI handle heavier bullets when the case is longer than the 284 case?...unless the throating is significantly different...
 
Rembo said:
what makes the 6mmAI handle heavier bullets when the case is longer than the 284 case?...unless the throating is significantly different...
Click to expand...

I can`t really say for sure why the diff but all`s I know is that the 6/284 with the 100 gr Speer will crony @ 3200fps Where as the same bullet in the 6mmAI you can push to 3400fps. Could be because the 6mm parent case has an inordinate amount of case body taper,so the is a considerable gain in usable case capacity over the 284 case.

Garnet
 
The 6mm-284 has more "usable" case capacity than the 6mm AI. The reason you are getting higher velocities with the same bullet (in assumed same barrel lengths) is that you are running much higher pressures in the 6mm AI.

dusty61 said:
I can`t really say for sure why the diff but all`s I know is that the 6/284 with the 100 gr Speer will crony @ 3200fps Where as the same bullet in the 6mmAI you can push to 3400fps. Could be because the 6mm parent case has an inordinate amount of case body taper,so the is a considerable gain in usable case capacity over the 284 case.

Garnet
Click to expand...
 
barrel twist rate???????????

The twist rate you've chosen is the original Remington twist 1in12 and the reason the 6mm did not become as popular as the Win 243. The 1in12 will handle weights up to 87gr BUT the 1in9 is more versatile and will handle everything up to the 105 Hornady. The 100 to 105 would be better for deer.
The 6mm ack or the standard 6mm will give you all the velocity you need.
 
I agree with b72471 on this - if you buy a 12" twist barrel you're not going to be shooting 100+ grain bullets worth a darn. Go for the 9" twist.

Eric


b72471 said:
The twist rate you've chosen is the original Remington twist 1in12 and the reason the 6mm did not become as popular as the Win 243. The 1in12 will handle weights up to 87gr BUT the 1in9 is more versatile and will handle everything up to the 105 Hornady. The 100 to 105 would be better for deer.
The 6mm ack or the standard 6mm will give you all the velocity you need.
Click to expand...
 
I'm going for the 1 in 12 twist BECAUSE I want to shoot mostly 60-70 grain bullets. I'd much rather have a tack driving load for coyotes then deer.

Cordur,
I don't know about ALTA but you can't use a 224 calibre for deer in SASK.
And a 22-250AI isn't necessary...I already have a 22-243 Middlestead.
 
My standard 6mm Rem shoots 55g to 100g through a 10" twist accurately ... I doubt a 12" twist will be shooting the 100's accurately at distance, and if you're shooting big deer in Saskatchewan at long range you may need that. I don't see the downside.

Just my opinion ... ;)
 
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